Which of the following statements regarding breathing and circulation in insects is false?
A) Insects lose very little water by using a tracheal system to breathe.
B) The tracheal system of insects consists of a series of branching air tubes that extend from the surface to deep inside the body.
C) Terrestrial animals such as insects spend much more energy than aquatic animals to ventilate their respiratory surfaces.
D) The circulatory system of insects is not involved in transporting oxygen.
Answer: C
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A microbiologist is attempting to determine the size of a microbial population and has employed several methods. She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count. This discrepancy was encountered during multiple trials. What is the most likely reason for the discrepancy?
A. She counted incorrectly. B. She did not correctly do the serial dilutions prior to the viable plate count. C. The medium and growth conditions used for the viable count will not support the growth of the organisms. D. Many of the organisms viewed during the direct count may be dead. E. The organisms were not readily cultured on the viable count, either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.
Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
The genus Veillonella is unusual because it grows well on organic acids such as lactate and pyruvate, but is normally unable to ferment glucose and other carbohydrates.
Answer the following statement true (T) or false (F)
Describe the process of atherosclerosis and discuss two possible complications for the affected
individual. What will be an ideal response?